Non-spherical tank and liquefied gas carrier ship equipped with the non-spherical tanks

Patent metadata

Field	Value
Publication number	US-10450039-B2
Application number	US-201615563821-A
Country	US
Kind code	B2
Filing date	Mar 15, 2016
Priority date	Apr 10, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

To provide a non-spherical tank which includes: a circular cylindrical portion; a top portion disposed continuously with an upper side of the circular cylindrical portion; and a bottom portion disposed continuously with a lower side of the circular cylindrical portion, wherein the top portion includes: a spherical shell portion which is formed of a portion of a spherical body having a radius R 1 , and is disposed at an upper end of the top portion; and a toroidal portion which is disposed continuously with the upper side of the circular cylindrical portion and with a lower side of the spherical shell portion respectively, and is formed of a portion of a spherical body having a radius R 2 smaller than the radius R 1 , and an expression 1.0<R/H 1 <1.5 is satisfied. Here, “R” denotes a radius of the circular cylindrical portion, and “H 1 ” denotes a height of the top portion in a vertical direction.

First claim

The invention claimed is:

1. A non-spherical tank for storing a liquefied gas, the non-spherical tank comprising:
a circular cylindrical portion extending along a vertical direction and having a cylindrical shape;
a top portion having a head plate structure where the top portion is disposed continuously with an upper side of the circular cylindrical portion and projects upward; and
a bottom portion having a head plate structure where the bottom portion is disposed continuously with a lower side of the circular cylindrical portion and projects downward, wherein
the top portion includes:
a top-portion-side spherical shell portion which is formed of a portion of a spherical body having a first radius, and is disposed at an upper end of the top portion; and
a top-portion-side toroidal portion which is disposed continuously with the upper side of the circular cylindrical portion and with a lower side of the top-portion-side spherical shell portion, and is formed of a portion of a spherical body having a second radius smaller than the first radius,
a center position of the spherical body having the first radius which forms the top-portion-side spherical shell portion is disposed on an extension of a line which connects a connecting position at which the top-portion-side spherical shell portion and the top-portion-side toroidal portion are connected with each other and a center position of the spherical body having the second radius which forms the top-portion-side toroidal portion, and
a following conditional expression is satisfied:
1.2< R/H 1≤1.45  (1)

R 1/ R 2<2.5  (2)

R 2/ R> 0.4  (3)

where “R” denotes a radius of the circular cylindrical portion, “R 1 ” denotes the first radius, “R 2 ” denotes the second radius, and “H 1 ” denotes a height of the top portion in the vertical direction.

2. The non-spherical tank according to claim 1 , wherein a following conditional expression is satisfied:
1.0≤ R/H 2<1.5  (4)

where “H 2 ” denotes a height of the bottom portion in the vertical direction.

3. The non-spherical tank according to claim 2 , wherein
the bottom portion includes:
a first-bottom-portion-side spherical shell portion which is formed of a portion of a spherical body having a third radius, and is disposed at a lower end of the bottom portion; and
a bottom-portion-side toroidal portion which is disposed continuously with an upper side of the first-bottom-portion-side spherical shell portion, and is formed of a portion of a spherical body having a fourth radius smaller than the third radius.

4. The non-spherical tank according to claim 3 , wherein a center position of the spherical body having the third radius which forms the first-bottom-portion-side spherical shell portion is disposed on an extension of a line which connects a connecting position at which the first-bottom-portion-side spherical shell portion and the bottom-portion-side toroidal portion are connected with each other and a center position of the spherical body having the fourth radius which forms the bottom-portion-side toroidal portion.

5. A liquefied gas carrier ship comprising:
the non-spherical tank according to claim 1 ; and
a tank cover covering an upper half portion of the non-spherical tank, and extending along a bow-stern direction and along a ship width direction.

Assignees

• Mitsubishi Heavy Ind Ltd
• Mitsubishi Shipbuilding Co Ltd

Inventors

• Okafuji Takashi
• Hirota Kazuhiro
• Takada Ryusuke
• Watanabe Michihisa
• Miura Kazuhiro

Classifications

• F17C2270/0105

  Ships · CPC title

• F17C2260/017

  by calculation · CPC title

• F17C2223/033

  Small pressure, e.g. for liquefied gas · CPC title

• F17C2223/0161

  cryogenic, e.g. LNG, GNL, PLNG · CPC title

• F17C2205/013

  Two or more vessels · CPC title